Synthesis of high performance epoxy/silica hybrids by using the sol-gel reaction

利用溶胶-凝胶反应合成高性能环氧树脂/二氧化硅杂化物

基本信息

批准号：
11650711
负责人：
OCHI Mitsukazu
金额：
$ 2.37万
依托单位：
Kansai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650711/
关键词：
organic inorganic hybrids epoxy resin silane coupling agent sol-gel reaction thermal properties mechanical properties adhesive properties

项目摘要

In this study, the epoxy/silica hybrids were synthesized and characterized for improving the thermo-mechanical properties of the cured epoxy resin. The hybrids were prepared by the in-situ sol-gel polymerization of the silane alkoxide in the presence of a basic catalyst in the liquid epoxy resin which was used as both the organic monomer and solvent for the sol-gel reaction.In this hybrid, the silica networks were uniformly dispersed in the epoxy networks as the nano-meter size of clusters. The control of the interaction (e.g. the formation of the covalent and hydrogen bondings) between the epoxy and silica networks was the most important factor for preparing the epoxy/silica hybrids in which both the networks is dissolved in the molecular order.The glass-rubber transition of the epoxy/silica hybrids was rapidly disappeared with the progress of the hybrization in the epoxy and silica networks. This was due to the suppression of the Micro-Brownian motion of the epoxy networks with the hybrization of the silica networks. Thus, it is clear that the heat resistance of the cured epoxy resin is considerably improved by the hybrization with the silica networks. The coatings made from the epoxy/silica hybrids showed the high hardness and rigidity, and the slightly low toughness and flexural strength in the glassy region.

在这项研究中，合成并表征了环氧树脂/二氧化硅杂化物，以改善固化环氧树脂的热机械性能。该杂化物是通过在液体环氧树脂中在碱性催化剂存在下，通过硅烷醇盐的原位溶胶-凝胶聚合来制备的，该液体环氧树脂用作溶胶-凝胶反应的有机单体和溶剂。在该杂化物中，二氧化硅网络以纳米尺寸的团簇形式均匀分散在环氧树脂网络中。控制环氧和二氧化硅网络之间的相互作用（例如共价键和氢键的形成）是制备环氧/二氧化硅杂化物的最重要因素，其中两个网络都以分子顺序溶解。随着环氧树脂和二氧化硅网络中杂化的进展，环氧树脂/二氧化硅杂化物的转变迅速消失。这是由于二氧化硅网络的杂化抑制了环氧树脂网络的微布朗运动。因此，很明显，固化环氧树脂的耐热性通过与二氧化硅网络的杂化而得到显着改善。由环氧树脂/二氧化硅混合物制成的涂层表现出高硬度和刚性，以及在玻璃态区域略低的韧性和弯曲强度。